Cabinet for arc lamps



e t. 1 Y S J. H. WAGENHORST CABINET FOR ARC LAMPS Filed March 4, 1926 3 Sheets-Sheet 1 p 1927' QH, WAGENHORST CABINET FOR ARC LAMPS 3 Sheets-Sheet 3 Filed March 4, 1926 W W Q vide a cabinet of chea Patented Sept; 6, 1927.

UNITED STATES JAMES waennnonsr,

HPATENT- OFFICE.

F JACKSON, MICHIGAN.

CABINET FOR ARC LAMPS.

Application filed March 4, 1926. Serial m. 92,202.

' provide an'arc lamp and cabinet, in which tion provides means for cooling these parts.-'

photographed.

the operating parts of the lamp are support- I ed by the cabinet itself as distinguished from prior structures in which the cabinet-serves merely as a housing for the lamp. A further object of my invention is to provide a construction in which the supporting elements-for the operating parts of the lamp help to reinforce and stiffen the cabinet.

.A further object of my invention is to provide a construction in which the rheostat and control parts for operating the lamp are housed so as to be protected from the direct heat of the arc, and in which the construc- A-further object of my invention is to provicle a'cabi'net for an arc lamp which gives a relatively wide angle of light propagation.

A further object of my invention is to provide an arc lamp and cabinet of such a nature that the lamp and cabinet can be 001-. lapsed 'to a comparatively fiat package for .the purpose of transportation.- This is parthe use of such lamps in motion picture studios, in which it is frequently necessary for the operator to pack up the lamps and transport them to a location which is to be A further object/of my invention is to pro- .vide a' cabinet construction for are lamps which provides asupport, at the proper dis- .tance from the are, for a diffusing curtain'or screen.

Further objects, and objects relating to details and economies of construction and operation, detailed description to follow. In one instance, I have accomplished the objects of my invention by the devices and means set forth in .the following specification. My

invention is clearly defined and pointed out in the-appended claims. Astructure congtitlit ng a p eferred embodiment of my inticularly advantageous in connection with depress on,

will definitely appear from theventi'on is illustrated in the accompanyingdrawings, forming a part of this specification, in which:

Fig. 1 is a perspective view of a lamp embodying'my invention mounted upona stand in position for use, the curtain being shown drawn across the front of the lamp to difcover for the compartment housing the solenoidand other control parts being removed. Fig. 6 is a perspectivewiew showing the back of the cabinet, and I Fig. 7 is a detail, sectional view, taken on the line 77 of Fig.3.

In the drawings, the same reference numerals refer to the same' parts throughout the several views.

In general I accomplish the objects of my invention by providing a sheet metal cabinet: of substantially rectangular shape, that is, having a back wall and side and end walls. The central portion of the back wall,- however, is pressed rearwardly forming a rearwardly-extending central depression oppoof the back wall on. opposite sides of the central depression and extending across said which brace bars not-only serve to stiffen the whole structure but-also form supports for the lower'or stationary electrodes, for the electrode 1 guides through which the upper or movable electrodes work,

and for the feeding mechanism for the elec trodes. .I have further purposed to mount the feeding solenoid and its dash pot at one side of the cabinet in the space between'the side portion of the back wall and one of the side walls, and to mount the. rheostat in a similar space at the opposite side of. the cabinet. These spaces may be confined by removable lids or covers inclined at an an 1e and cutting off the corner portions oft e cabinet, forming separate compartments in which these operati parts are housed. I pro ose to provide t e portions of the end W5 s-of the cab'net forming the tops and the clamping members 48 mounted upon the in Figs. 2 and 4.

binding posts 49 carried by the bar.

I A similar brace bar 50 of an le cross-section extends across the centra portion of this depression in the rear wall of the cabinet, the horizontal leg of this angle member being cut away, as shown in Fig. 4, leaving fiat ends on said bar: which lie against the rear wall portions 23 and 24 and are secured thereto by the bolts 51. Like the bar this brace bar serves to strengthen the structure and it also provides a support for the uide members 52, of insulating materia, which are bolted to the horizontal flange of said angle bar. These guide members 52 guide and support the movable electrodes 53, and the feeding clutches 54,-

which engage one electrode in each of the two pairs .of upper electrodes, are connected .to the vertical legs 55 of the yoke 56, with ,the lower ends of said legs extending through holes in-said insulating guide members 52. A; similar angle brace bar 67 ex-v tendsacross the central depression in'the' 'r'ear wall near the u per end thereof, being secured to the portlons 23 and 24 of the cabinet by means of the bolts .68. This angle bar 67 carries a pivot pin 66 on which the lever 59 is. fulcrumed. The yoke 56 is clamped within a saddle member .57 which is pivoted on the inner end of the lever 59 by means of thepin-58. A yoke 60 is suspended from the outer arm of the lever 59 'and'connected through, a spring 61, to a solenoid armature 62 working in the solenoid 63, this yoke being also connected with a plunger working in the dash pot 65. The feeding solenoid 63 is mounted in a bracket 64, fastened-to theside wall 25 of the cabinet. "A

resistance coil, or rheostat, 69 1s mounted at the opposite side of the cabinet, as shown A compartment of triangular cross section, housing the feeding solenoid and its dash pot, is formed at one side of the cabinet by means of a removable cover 70, which, at one end, is folded upon itself and bent to form 1 a flange. 71 lying parallel to the rear wall portion 24 of the cabinet and secured thereto by the bolts 72. The forward edge of this cover 7 O is bent upon itself, forming a groove 73, which receives the forward edge of the side wall 25. This cover is secured in place by means of the bolts 43, which also form the hinge connections for the wings 34. This portion of the end wall v28forming the bottom of this compartment is provided with a number of ventilating holes 75 and the corresponding portion of the end wall 27 forming the top of the compartment is provided with ventilating holes 76, so that 'acurrent of air may pass through the holes 75 and up through the compartment in which the feeding solenoid, and its dash pot and connec- In this way, these parts may be kept cool by the current of air ascending through this compartment, as through a flue. A similar cover 70, similarly connected to the cabinet, is provided at the other side thereof. The rheostat 69 is mounted upon this removable cover 70 by means of the block 95 secured to this cover and provided, at intervals, with binding posts 73 to which the Wires may be connected. The bottom and top walls of this compartment are also provided with ventilating. holes 75 and 76 so that this compartment containing the rheostat may be cooled by the action of a current of air ascending through it as throu h a flue. These cover plates 70 not only orm separate compartment-s at the sides of the cabinet but also strengthen andreinforcc the cabinet mat-erially since, injeflect, they form trusses at the sides thereof.

The bracket 17 for supporting the cabinet includes the vertical legs 77, the ends of which are turned laterally at 99 and extend through the'side Walls 25 and 26 of the cab inet into bearings 98 carried by brackets bolted to the rear wall and lying against each other,and with a pin 7 9- extending, transversely therethrough.

The two end portions 78 of this bracket con- I stitute, in effect, a post which fits in the upperend ofthe standard 15 and supports the lamp upon said standard. The cabinet may be kept from turning upon its bearings on. the inturned ends 99 of the arms 77 of the bracket by means of the set screws 80 extending through the rear wall of the cabinet.

and engaging said inturned ends.

Brackets 81 are fastened to the end walls 27 and 28 ofthe cabinet, and provided with openings receiving the pins at the'ends of the roller 82 on which thedifl'using screen orcurtain 83 is mounted. This curtain is adapted to be drawn from the roller 82 across the front of the cabinet and across the frames mounted on the wings 34, as indicated by dotted lines in Fig. 4, and is to be held in place across the front of the cabinet by means of clips 84 mounted on the rear wall portion 24. 1

A porcelain thimble 85 is provided in the lower portion of the inclined back wall 20 nected to the solenoid 63, at 88. A wire 89,

' leading from the upper end of the solenoid 63, extends through a similar porcelain thi1nble 90 in the cover plate 7 O and is connected to the electrode holder and guide 91', which is clamped on the upper ends of the pair ofv on the upper ends of the other pair of movable electrodes, is connected by a wire 94; to I one of the binding posts 7 3 of the rheostat 69, for instance, to the up r oneof these binding posts, as shownin ig. 2. The wire 97 is connected to another of the binding posts 7 3, for instance, the lower'one shown in Fig. 2, and extends out through the porcelain thimble 85. The clamping members for the lower electrodes are electrically connected by the wire 92. An asbestosmat 100 may. be fastened on the bottom wall of the cabinet under the lower ends of the station-. ary electrodes .so as to catch any sparks or ashes falling from the burning arcs.

The construction of the mechanism for feeding the electrodes toand from each other, so as to draw and maintain the arcs, is not described in detail in this application as it forms the subject-matter of another application entitled Arc lamps, filed by me in the Patent Office of even date herewith.

I am aware that the particular construction disclosed in this application is susceptible of considerable variation without departingfromthe-spirit of my invention and,

therefore, I claim my invention broadly as indicated by the appended claims.

hat I claim is:

1. A cabinet for an arc-lamp having stationary and 'movableelectrodes and feeding mechanism therefor, comprising rear, side and end walls, the rear wall having a central rcarwardly extending depression therein, and a plurality of brace bars secured to the cabinet and extending across said depression, said brace bars reinforcing the cabinet and supporting the electrodes and the feeding mechanism therefor.

2. In an arc lamp provided with stationaryelectrodes, a cabinet having rear, side and end walls, said rear wall having a central rearwardly extending depression, and a brace bar connected to portions of said rear wall at the sides of said depression and extending across said de ression, said brace bar reinforcing the cabinet and supporting the stationary electrodes of the arc lamp.

3. In an arc lamp, the combination with stationary and movable electrodes and operating mechanism therefor, of a cabinet having rear, side and end walls and a central rearwardly extending depression in said rear wall, and a brace bar connected to the portions of said rear wall adjacent the sides of said depression and extending across said depression, said brace bar reinforcing the movable electro. es.

cabinet and-su porting a guide for said 4. In an arc lamp, thecombination with ing mechanism-therefor, of a cabinet having rear, side and end walls, the rear wall having a central 'rearwardly extending depression therein, and a brace bar fastened to the portions of said rear wall at the sides of sald epression and'extendin' across the same, the said bracebar rein orcing the cabinet and supporting the feeding mechanism for the movable electrodes.-

5. In an arc lamp, the combination with stationary and movable electrodes and a stationary and movable electrodes and-feedlever for feeding the movable electrodes with respect to the stationary electrodes, of

acabinet having rear, side and end walls'.

and a c'entral rearwardly extending depression in said rear wall, and a brace bar .fas-

tened to the portions of said rear wall at thev sides of said depression and extending across the same, said brace bar reinforcing the cabinet and supporting the feed lever.

6. In an arc lamp, the combination of stationary and movable electrodes, means for feeding the movable electrodes with respect to the stationary electrodes, and, a cabinet supporting and housing said parts and pro;

vided wlth com artments at the two sides thereof for houslng the electrical mechanism controlling the feeding of the movable electrodes.

7. In an arc lamp, the combination with stationary and movable electrodes, and feeding mechanism therefor including a solenoid, of a cabinet housing and supporting said opcrating parts of the lamp and a compart- 'ment formed at one side of said cabinet and housing the feeding solenoid.

8. In an arc lamp, the combination with stationary and 'mo vable electrodes and a rheostat connected in circuit with said elcc-- trodes, of a cabinet housing and sup orting said parts of the lamp and a compartment provided at one side of the cabinet in] which the rheostat is housed.

9. In an-arc lamp, the combination of stationary and movable electrodes, feeding mechanism for said movable electrodes including a solenoid, a rheostat connected in circuit with said electrodes, and a cabinet housing and supporting the operating parts of said lamp an having a compartment at one side thereof housing the feeding solenoid and 00-0 crating parts and a compartment at the ot 1B1 side housing therheostait.

10. The combination of a cabinet for are lamps having rear, side and end walls and a central rearwardly extending depression formed in said rear Wall. and a removable cover plate extending diagonally from the front edge of one side wall to the rear wall adjacent the edge of the central depression therein, said'cover plate bracing the cabinet 1,041 aoa and forming a compartment at one side thereof adapted to house certain of the operating parts ofthe lamp.

T 11. In an arc lam the combination, of

stationary and mova le electrodes, feeding mechanism therefor including a solenoid connected in an electric circuit with said electrodes, a cabinet having rear, side and end walls, and aremovable cover plate forming,with the rear, side and end walls a com-.

partment within which said solenoid is mounted, the portions of the end walls of the cabinet forming the upper and lower ends of said compartment having openings to permit the clrculation of air through the compartment for cooling the solenoid.

12. In an arc lam the combination of stationary and movab e electrodes, 9. rheostat included in the electric circuit with said electrodes, a cabinet having rear, side and end walls, and a removable cover plate formin with said walls a compartment in which sai rheostat is mounted, the portions of the end walls forming the top and bottom of said compartment having openings therein for the urpose of permltting the circulation of air t rough the compartment forcooling the rheostat.

13. In an arc lam the combination of stationar and movab e electrodes, a rheostat connecte in an electric circuit with said electrodes, feeding mechanism for the movable electrodes including a solenoid connected in circuit therewith, a cabinet housin and supporting the operating parts of sai lamp an including rear side and end walls, and removable cover plates forming, with said walls, compartments at the sides of the.

lamp, one of'sald compartments housing the solenoid and the other the rheostat, the end walls of said cabinet forming the top and "15."In an arc lam bottom of said compartment having openin therein to ermit the circulation of air through com artments. 14. In an arc lam stationary and'movale electrodes, feeding mechanism for said movable electrodes includinga solenoid connected in circuit there-. with, a cabinet housing and su porting said parts and including a rear wa l with a central, rearwardly-extending depression, and

- side and end walls, and a removable cover plate extending dia onall'y from the front edge of the side wal to sa1d rear wall adjacent the edge of the central depression therein, said cover plate bracing the cabinet and forming a compartment within which saidsolenoid is mounted, the portions of the end walls forming the top and bottom of said compartment having holes formed therein .-.to ermit the circulation of air through sai compartment for cooling the; solenoid. Y

the combination of stationary and movab e electrodes, a rheostat the combination of connected in an electric circuit with said electrodes, a cabinet housing and supporting said parts and provided with rear, side and end walls, said rear wall havinga central, rearwardly-extending depression therein,

and a removable cover plate extending diag-- onally from the front edge of one side wall to the rear wall, adjacent the sideof the central depression therein, said cover plate bracing said cabinet and forming a compartment within which said rheostat. is mounted on the inner wall of said cover plate, and the end walls of said cabinet being provided with holes in positionto permit the circula tion of air through said compartment.

16. In an arc lam the combination of mechanism therefor including a solenoid connected in circuit with said electrodes, 'a rheostat'also connected in said circuit, a cabinet housing and; supporting the parts of said stationary and mova le electrodes, feeding lam and including rear, side and end walls,

sai rear wall having a central, rearwardlyextendin depression therein, and apair of 'removab e cover lates extending diagonally from the front e ges of the side walls to the portions of the rear wall adjacent the sides I of said central depression, said'cover plates bracing the cabinet and forming compartments at the sides thereof housing said solenoid and rheostat, respectively.

17 The combination of a' cabinet for are lamps havin rear, side and end walls, and

away from the front of the lamp-a light I portions of the end walls of said cabinet,'and i I frames secured to each of said' plates or wings and comprising l'e portions extending at right angles to the ha y of said wings and an inclined portion connecting the up er. ends of said leg portions, oneof said eg portions being extended through the wing andextended parallel to one edge thereof, the end portion of said wing being wra ped around saidportion of the frame, an end of said portion of the frame being bent the to form an eye co-operating with a bolt passing through the side of the cabinet to form a hinge member for hinging thewing to the cabinet.

20. Inan arc lamp, the' combination of movable and stationary electrodes, feedin mechanism therefor, a cabinet housing an 30 supporting said parts, brackets fastened to the end walls of said cabinet, a curtain roller supported by said brackets, and a diffusing curtain mounted on said roller and adapted to be drawn across the front of the cabinet to diffuse the light coming from the are.

21. In an arc lamp, the combination of stationary and movable electrodes, feeding mechanism therefor, a cabinet housing and supporting said parts, brackets carried by said cabinet, 'a curtain roller supported by said brackets, light deflecting win shinged to the front portions of the end Wa ls of said cabinet, frames carried by said wings, and a diffusing curtain mounted on said roller and adapted to be drawn across the front of said cabinet and across said frames to diffuse the light coming from the arc.

22. In an arc lamp, the combination of stationary and movable electrodes, feedin mechanism therefor, a cabinet housing an supporting the arts of said lamp and including rear, si e and endwalls, bearings mounted within the cabinet upon said rear wall, and a supporting bracket for said cabinet and lamp provided with arms and laterally turned studs at the ends of the arms, said studs extending through the side walls of said cabinet and being journaled in the said bearings.

JAMES H. WAGENHQRST.

r l 641 314 Sept 1927' H. L. BRADLEY v VARIABLE CONDENSER Filed OCC-lT, 1924 2 Sheets-$heet 1 I zkfiTZ 7 v gwue'nto'a H X6607? L. fiiwri 

